例4.5设采样频率f=1000Hz,设计n=10阶的 Butterworth的高通 滤波器,截止频率on=300Hz 解:[ba]= butter(10,300/500,high);fegz(b,a,512,1000 (ex45.m) 10 050100150200250300350400450500 Frequency(Hz) 500 1500L 050100150200250300350400450500 Frequency(Hz)例4.5 设采样频率fs=1000Hz,设计n=10阶的Butterworth的高通 滤波器，截止频率ωn=300Hz。 解： [b,a]=butter(10,300/500,’high’)；freqz(b,a,512,1000) (ex45.m) 0 50 100 150 200 250 300 350 400 450 500 -400 -300 -200 -100 0 100 Frequency (Hz) Magnitude (dB) 0 50 100 150 200 250 300 350 400 450 500 -1500 -1000 -500 0 Frequency (Hz) Phase (degrees)